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Old 09-13-2013, 11:13 AM   #1
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ISB (D) vs ISL (MA)

Apologies, since it has to be here or at cummins, but after a couple futile hours I may be
My question has to do with the 450hp Cummins differences between DS and MA's. The ISL (MA) has a 20,000 mile change interval, while I asssume the interval is 15,000 (guess) on the ISB (DS). Perhaps it is trivial, but it is part of my personal decision matrix which is coming down to Mtn Aire vs Dutch Star.
Are there other significant differences between the two 450hp engines?
JM
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Old 09-13-2013, 12:01 PM   #2
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If you're deciding on a new coach, the DS and the MA now have the same engine.
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Old 09-13-2013, 12:27 PM   #3
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isb v isl

Yes, Trying to decide.
Yesterday I picked up the new 2014 brochures at the Dallas RV Show. DS shows a Cummins 450 ISB, MA Shows Cummins 450 ISL.
Hence, my question.
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Old 09-13-2013, 12:33 PM   #4
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go to Newmars' website and look at both, the DS now has a standard ISL
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Old 09-13-2013, 12:50 PM   #5
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The ISB does not have that much HP. It's an ISL.
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Old 09-13-2013, 01:39 PM   #6
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As others have stated, if it says ISB, it's a typo. It looks like last year the MA had a 450HP ISL and the DS had a 400HP ISL but it was still ISL on each.
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Old 09-13-2013, 01:54 PM   #7
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We looked very closely at a 2012 DSDP 43', it had the ISL 450 as standard equipment.
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Old 09-13-2013, 02:34 PM   #8
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Quote:
Originally Posted by James Macfet View Post
Yes, Trying to decide.
Yesterday I picked up the new 2014 brochures at the Dallas RV Show. DS shows a Cummins 450 ISB, MA Shows Cummins 450 ISL.
Hence, my question.
MUST be a TYPO because the ISB is Cummins smallest RV motor, and I believe maxes out at ~350HP. FCCC "may" use the ISB in their smallest chassis for entry level coaches, but no way that is under a DSDP.

Cummins offers 4 motors for RV uses, there is also an ISC, an ISL, and the largest is ISX.
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Old 09-15-2013, 06:23 AM   #9
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may be a dumb question but what does dsdp stand for
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Old 09-15-2013, 06:28 AM   #10
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Old 09-15-2013, 06:36 AM   #11
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I have a 2012 DSDP with a 450hp ISL. As stated earlier the MA & DS have the same engine, transmission and chassis.
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Old 09-22-2013, 08:31 AM   #12
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.......
Cummins offers 4 motors for RV uses, there is also an ISC, an ISL, and the largest is ISX.
Apparently my info (above) is outdated. The most recent Cummins ad in FMCA magazine ad does not list the ISC among their engine choices.

Cummins still offers 4 choices, but they are: ISB6.7, ISL9, ISX12, ISX15.

I have no idea why they apparently dropped the ISC.
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Old 09-22-2013, 08:58 AM   #13
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Apparently my info (above) is outdated. The most recent Cummins ad in FMCA magazine ad does not list the ISC among their engine choices. Cummins still offers 4 choices, but they are: ISB6.7, ISL9, ISX12, ISX15. I have no idea why they apparently dropped the ISC. Ed
Cummins still offers the ISC:

http://cumminsengines.com/showcase.aspx?Categories=100

It is a fact that they have marketed the ISL heavily to motorhome and chassis OEMs. The ISC still represents an attractive step up from the ISB when the GVWR gets up over 26k.
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Old 09-22-2013, 09:17 AM   #14
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Cummins still offers the ISC:

The ISC still represents an attractive step up from the ISB when the GVWR gets up over 26k.
I hope you are right, Steve, as I've always thought the ISC was a tough, durable "mid-range" engine. Glad to know I wasn't "wrong" after all, but as I posted, the ISC is not shown in their motorhome-specific ad.

FWIW, there a quite a few coaches with GVWRs >26K using the ISB, which I think is "penny wise & pound foolish".
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